Wobbuffet- I thought it was useless, pointless and stupid looking. Until I realized it is the ultimate definition of BOSS. It's stupid face soon became hilariously derpy and awesome to me (along with Quagsire, Dunsparce, and Shuckle's) and I soon grew to love it. Also because of its interesting in battle capabilities, and because my friends at first also hated it, so when I used it they would think it was terrible, until it OHKO'd their strongest pokemon

Samaurott- I absolutely hated it when I first saw it, I loved Oshawott so much, so I thought this was a disgrace. However I soon grew to love it after a while. It grew on me, and I realized how cool looking it was (complete with awesome facial hair)

Eelektross- At first I thought it was just plain ugly, with its weird mouths, but eventually I saw it less for its mouth and more for its design as a whole, which I now think is very cool

Kyurem- I also disliked this one at first, mainly because it looked so weird and unbalanced. But soon I realized that was the point, it was meant to be unbalanced, because that's what it was based on. I also began to see it for its more frightening appearance (just imagine running into this thing in a blizzard!) which made me like it more (I like things that are chilling, PUN COMPLETELY INTENDED!)